Note 10 - Fair Value of Financial Instruments (Detail) - Financial assets and liabilities reported under the fair value option: (USD $) In Thousands, unless otherwise specified	3 Months Ended			3 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended		3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Mar. 31, 2013 Collateralized Mortgage Backed Securities [Member]	Dec. 31, 2012 Collateralized Mortgage Backed Securities [Member]	Mar. 31, 2012 Collateralized Mortgage Backed Securities [Member]	Mar. 31, 2013 Other securities [Member]	Dec. 31, 2012 Other securities [Member]	Mar. 31, 2012 Other securities [Member]	Mar. 31, 2013 Borrowed funds [Member]	Dec. 31, 2012 Borrowed funds [Member]	Mar. 31, 2012 Borrowed funds [Member]	Mar. 31, 2013 Financial Assets And Liabilities, Excluding Interest Rate Caps / Swaps [Member]		Dec. 31, 2012 Financial Assets And Liabilities, Excluding Interest Rate Caps / Swaps [Member]
Fair Value Measurements	$ 47,900		$ 54,500	$ 17,965		$ 24,911	$ 29,933		$ 29,577
Changes in Fair Values For Items Measured at Fair Value Pursuant to Election of the Fair Value Option	(123)	(448)		(362)	(18)		273	241		(819)	171		(908)	[1]	394	[1]
Borrowed funds	24,700		23,900							24,742		23,922
Borrowed funds	(123)	(448)		(362)	(18)		273	241		(819)	171		(908)	[1]	394	[1]
Net gain from fair value adjustments (1)	$ (123)	$ (448)		$ (362)	$ (18)		$ 273	$ 241		$ (819)	$ 171		$ (908)	[1]	$ 394	[1]

[1] The net gain (loss) from fair value adjustments presented in the above table does not include net gains of $0.8 million and losses of $0.8 million for the three months ended March 31, 2013 and 2012, respectively, from the change in the fair value of interest rate caps / swaps.